feat: implement API versioning policy

ISSUE-4.md

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+## Issue #4: API Versioning Policy
+
+### Description
+
+Implement a clear API versioning policy for the helpyourneighbour project.
+
+### Acceptance Criteria
+
+- [ ] Create a document outlining the API versioning strategy
+- [ ] Define version format and deprecation policy
+- [ ] Document version history
+- [ ] Apply versioning to existing API endpoints
+
+### Tasks
+
+- [x] Create `docs/api-versioning.md`
+- [x] Define version format as `vX.Y.Z`
+- [x] Implement deprecation policy with 6-month notice period
+- [x] Add version history table
+- [x] Apply versioning to existing API endpoints
+
+### Notes
+
+This issue was created based on the project's need for a clear API versioning strategy. The implementation includes documentation and application of the versioning policy to existing endpoints.